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I'm trying to find good C++ library, which supports this features:
so this is the task
Free license (Apache, MIT, LGPL which I can use for commercial).
Accept several severity levels (Like error, notice, info etc).
Support to rollback the log files if they reach a size or a time
limit.
Support asynchronous writing.
Supports x86_64.
I make search, and found this libs:
Google glog
log4cxx
log4cplus
log4cpp
rlog
Pantheios
But none of them supports all of what I need. And for example rlog has a very poor documentation, from which I can't make my decision.
Maybe you can help me to find logging library?
Rollback a log file? nothing will support that.
The log4xxx ones will alllow you to write rolling log files - so when one reaches a certain size (or time, daily for example) it will start a new file.
The log4 ones are pretty standard and are really rather good, the performance of log4net trashed the Microsoft logging block for example, and as they support all the other languages it makes them a sort-of standard IMHO.
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We have requirement of C/C++ Parser in my application. What application does is it calls rest webservice and takes output from service. If output is JSON , it should parse it and shows the result to end user.
Could you please recommend me good/best C/CPP JSON parser (according to you) so that I can use in my application?
When I search online, I am getting multiple JSON parsers. But I would like to know about the best.
Thanks in advance
Assuming you're happy with a C++ implementation of the parser, I've not had any issues with nlohmann/json; although there are faster libraries it has been fast enough for my requirements and has the advantages that:
It is very easy to integrate into your project (single header)
A clean and simple API without excessively verbose syntax
Good test coverage
The Github page linked above has a great overview so it's not worth me going into much more detail here.
For a comparison of libraries along multiple facets (not just performance) you could look here: miloyip/nativejson-benchmark
I highly recommend Cereal. It's a portable, easy to use serialization library for C++, that supports JSON, XML, plain text, and binary formats.
We are happy with RapidJson, which is in use for AssetImporterLib for the GLTF-importer.
You can find a performance test here ( 100% is best ). Regarding to these examples RapiJson has won.
Be never measured the performance on our own to this lib in special.
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We're running an experiment which will involve collecting data from multiple stations around the world. Each station will be providing HDF5 files with magnetic field measurements in a rate of 1 kHz and some auxiliary data in real time. The latency is going to be a few minutes.
I'm assigned to design this program (in C++, with clients/server model, with server being in linux and clients being cross-platform), and apparently I'll be designing this from scratch. My first concern is not to really do everything from scratch because this will be more error prone and pure wrong, so my question here is: What information/file transfer protocols/libraries should I use so that
The program can live for 10+ years with minimal maintenance
I can have very good support from the community for when I need help.
Since we need something relatively secure, my first thought was libssh (the only cross platform opensource library available out there for ssh), but then after discussing with some pros there I realized that the support there isn't so wonderful because only a few people work with libssh. The pros there hesitated in suggesting OpenSSL, but with OpenSSL I'll have to write my own authentication (apparently, I'm not an expert and that's why I'm asking).
What would you suggest? Please share your vision to whether I should go for OpenSSL, libssh, or something else.
PS: Please, if you're going to start off by saying this question is off-topic, move on and ignore it. Consider being helpful rather than critical.
If you require any additional information, please ask.
I think that OpenSSL might be a good choice.
No you do not have to "write you own authentication" - you just need to generate certificates and keys and put them in the right places - that is all.
I would suggest to look at the examples in <openssl-source-dir>/demos and <openssl-source-dir>/apps to get you started. Reading a book about OpenSSL would also be a good idea - for many other reasons (sometimes not directly related with SSL/TLS).
I hope that helps.
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I am writing an application in which I need to be able to browse for an existing file and to create a new one. I need to create user interface for that. Is there any good cross-platform free library to help me do that?
If you're not already using a cross-platform UI library, then it doesn't make a lot of sense to introduce a dependency upon a huge library just to display a file dialog.
Since recommendations for a cross-platform UI library have already been hashed out repeatedly in other questions (use the search feature to find them if you're interested) and are probably off-topic anyway,
I'm going to take the liberty of assuming that such is not your question.
Therefore, the answer is that no, there is no reliable, cross-platform way of creating a file dialog. Each platform provides a different interface/API for this, so you'll need to write code to detect the current platform and then display the dialog as instructed by each platform's documentation.
You can do this either at run-time (if you want to have a single binary), or at compile-time by using conditional compilation (#if statements).
This is basically all that any UI library would be doing, and for such a simple requirement (a single feature) it makes sense to me at least to just do that work yourself.
You can give wxWidgets a try, a GUI library in C++, free, open-source,... and work with the native graphics libraries.
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I am currently developing a game which simulates an operating system. Therefore i need an ingame filesystem. Currently, i am using zziplib to be able to load files from a zip archive, however this is a readonly "filesystem" and i need a way to write new files and serialize them afterwards (and deserializing them during the next execution)! Are there any useful libraries out there in the wild to be used or should i write one for myself based on any ones?
This is probably one of the places where using a simple database as a filesystem makes sens.
Use something like sqlite to store the data (with paths as keys, blobs as data, or something like that).
One of the advantages of doing this is that you don't actually have to worry about the storage, and you can use existing database tools to view/edit the data "offline" rather than having to write your own. (Plus you can store other game info in there as well.)
You might check out PicoStorage and Embedded File System in C++. I haven't directly used either but I've looked at them both. Embedded File System does have a dependency which could be a show stopper -- it requires Qt to be linked in. Perhaps that could be removed, but it uses it mainly for QString and QFile (and would have no reason to require the UI).
Update, 9 years later: As commented, the above links no longer work. This alternative link for PicoStorage may be viable (I was able to download the source from there but I've made no effort to validate it) but I cannot locate a modern equivalent for EFS.
My six pence on top of the answers above. SolFS (now CBFS Storage) and CodebaseFS provide virtual file system capabilities; both have an API for C/C++ and appear to do exactly what you are asking about. Still... the scale of your task is not clear for me. Does your game need to manage dozens, hundreds, zounds, ... of files? What are the sizes of those files? Etc, etc. I would raise these questions before looking for an appropriate solution.
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Is there any portable c++ library to work with the filesystem?
I know about boost::filesystem, but I need to know if there is any other.
Thanks!
POCO has similar functionality which you can find under Foundation/FileSystem.
There is at least one more solution worth mentioning - STLSoft, a set of BSD-like licensed libraries, contains a cross-platform wrapper under Windows & Unix native filesystem APIs - PlatformSTL project. The benefit in comparison with boost::filesystem is no need to build anything, the whole library is header-only, you can simply include it in your project. The bad side is lack of documentation though, I spent quite some time to figure out how to use it.
What about QT's QFileSystemModel or QFSFileEngine?
You can find it in the SSVUtils library: https://github.com/SuperV1234/SSVUtils
I found that for an application which needs a lot more than the filesystem API defined in the language it makes sense to encapsulate the filesystem API yourself and on a per application level.
Because in this case you usually need some very specific features (you surely do on the iPhone/MacOSX) and this will be not very portable and also missed by boost and others. In this case you need to go a bit higher in your abstraction layer.
Today the operating system API isn't that bad anymore. Writing a wrapper shouldn't take long.